/Engine/Source/Runtime/Projects/Public/PluginDescriptor.h
Updates the content of the specified plugin file with values in this descriptor (hence preserving json fields that the plugin descriptor doesn't know about)
bool UpdatePluginFile ( const [FString](API\Runtime\Core\Containers\FString) & FileName, [FText](API\Runtime\Core\Internationalization\FText) * OutFailReason ) const